From openRDF.org: Sesame 2.4.1 is a bugfix release, fixing various reported issues in the new SPARQL 1.1 query functionality and a number of stability/scalability improvements. Some highlights:
- SPARQL GROUP BY with complex expressions as arguments are now evaluated correctly (SES-774)
SUM and AVG now silently ignore non-numeric values (SES-788)
- Performance improvements in processing of aggregate operators (SES-789)
- Fix for native store data corruption issue (SES-776)
- Various other fixes and improvements in handling of property paths and aggregate operators
See the release notes for a full overview of all changes.